Malicious PDF — malware analysis report

Static analysis result for SHA-256 e637a28522bc5115…

MALICIOUS

PDF

79.2 KB Created: 2021-05-03 01:42:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 2a6b14b39e9262e246815576fec40da9 SHA-1: 677709e6e90e83d8fcb489d24ffb195be680fed6 SHA-256: e637a28522bc51153a2f5da224b6599164d86cab0a70b392a26355c3af263812
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable domains, suggesting it's part of a link farm designed to manipulate search engine results or redirect users to malicious sites. The primary URL, 'https://ponafet.ru/strik?utm_term=what+is+the+meaning+of+mystical+in+english', appears to be a lure for users searching for specific terms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ponafet.ru/strik?utm_term=what+is+the+meaning+of+mystical+in+english PDF link annotation
    • https://cdn.sqhk.co/batumozi/dxeheia/butajixad.pdfIn PDF document text
    • http://mekujoviwe.mypressonline.com/dapubukisalirego.pdfIn PDF document text
    • http://tameeniraq.com/scenario_manager_excel_templatevo362.pdfIn PDF document text
    • http://remastacer.com/descartes_meditation_1_quotesaxltg.pdfIn PDF document text
    • http://komarovskii.xyz/c_j_i_ka_full_formolbm1.pdfIn PDF document text
    • https://surigogalabilix.weebly.com/uploads/1/3/5/9/135961506/noduwitaziwum_fiduwi_wokil_danenix.pdfIn PDF document text
    • https://cdn.sqhk.co/zururodi/hhkNXAo/45934026054.pdfIn PDF document text
    • https://zokilare.weebly.com/uploads/1/3/4/7/134767859/8666357.pdfIn PDF document text
    • http://frukt.space/amana_front_load_washer_troubleshootingx7iwy.pdfIn PDF document text
    • https://cdn.sqhk.co/pajazidif/ighbqib/download_stickman_fight_2_the_game_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/purovufizu/ghggfcJ/dice_tower_top_100.pdfIn PDF document text
    • https://tewiwumorivare.weebly.com/uploads/1/3/1/4/131409909/walaperipanaxinowifa.pdfIn PDF document text
    • https://sopazavevorud.weebly.com/uploads/1/3/4/3/134370644/06b3e293.pdfIn PDF document text
    • http://rewita.fun/how_to_identify_the_tone_of_a_poemtfhvf.pdfIn PDF document text
    • http://axacheat4.xyz/dufefulenawegunulubaw81xq2.pdfIn PDF document text
    • https://kudaxemukuwofi.weebly.com/uploads/1/3/4/6/134691428/memanujewunufut.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1fa5734-0b00-4a93-9c47-edcfd13d9fe6/how_to_pair_pioneer_bluetooth.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac5feaf8-e15f-4ec0-a042-d501fc452730/xowirojipomo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7da60047-a61a-4044-8064-ff87da13a1e4/piramimupegavi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f2c0017-af71-442a-91d9-37697a555ab7/how_to_use_a_mandrel_tube_bender.pdfIn PDF document text
    • http://jasunusemoki.onlinewebshop.net/livre_grammaire_anglais_francais.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF291 5312 bytes
SHA-256: f4b62087a1f86d9f8fd8be5392ab0d981c0ef58187f3af07eae3ddf372dfbbcc
font_01_sfnt_off0001049b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1049B 12524 bytes
SHA-256: 47e64572ef2416d76fac21a31e65f1f42f1e307187394458747c2dc197cffed9